13 questions for fins 30, 13 questions for fins

**Do you need a control group for the experiment of fish fins? Why? Tail fin: swings from side to side to push the fish forward; Determines the direction of movement, if lost, the fish will not turn Pectoral fin: When the tail fin is not moving, the pectoral fin is towards the fish.

Cut off the pectoral and pelvic fins of the 1st fish.

Cut off the dorsal and anal fins of the 2nd fish and the caudal fin of the 3rd fish.

It's pathetic!!

1. Dorsal fin: keep the fish body standing on its side, the balance of the fish body plays a key role, if it is lost, it will lose its balance and roll over.

2. The pectoral fin mainly plays the role of deceleration, and when the golden finger is missing, the fish swims to the edge of the tank, and the tail fin stretches out for a gear, and the fish stops. When goldfish swim upside down, they also use their pectoral fins. The tail fin is not strong.

The goldfish is different, the direction of the goldfish is not good, the goldfish body is too fat, so when the goldfish swims, the pectoral fins are generally perpendicular to the body. It's a stable direction.

3. Pelvic fin: help the pectoral fin to play a braking role, swing the body left and right when the fish swims, tighten the muscles on the side of the body to do S-shaped movement, and move the body forward by dialing the water.

4. The tail fin is the propeller for the goldfish to advance, no matter what kind of goldfish it is, it has to rely on the tail fin to swim. Note, however, that the tail fin is only used when swimming forward, not when retreating. Since the appearance of the double tail fin, the stability of the goldfish has increased a lot, because there is an additional stabilizing surface, so that although the goldfish has become very round and fat in the future, even the dorsal fin of some goldfish has changed, and the direction is still no problem in stability, which is the reason why the goldfish has evolved into four tails.

The head of the goldfish is large, and the head is not planted, which has a certain relationship with the increase in the tail fin, and the weight of the tail fin becomes more and increases, which plays the role of only the shed to the balance.

5. Anal fins: coordinate with other fins, play a role in balancing, if lost, the body shakes slightly.

This description is not comprehensive. There are three ways of fish movement: 1 Whole body muscle movement This is the most common and important way of fish movement, that is, fish use the alternating contraction of trunk and tail muscles to make the body twist left and right to carry the current, and the fish uses the reaction force generated by hitting the water.

Push the body forward. For example, eels.

Swimming with fish is a typical example of this type of movement. 2.Fin movement The fin is a unique locomotor organ of fish, and in the pectoral fin, pelvic fin, dorsal fin, anal fin and caudal fin, the caudal fin plays a greater role in the movement of fish.

Not only does it bind muscle activity to keep the body balanced, but it also controls the direction of the fish's swimming like a rudder. At the same time, the movement of the tail fin of the fish is also one of the driving forces to promote the fish body with the movement of the muscles of the whole body. In nature, there are very few fish that rely entirely on their fins for locomotion, such as seahorses.

The forward movement is done entirely by the oscillation of the dorsal fin. 3 Gill hole drainage is the use of water jetted out of the gill hole when breathing. For example, one of the reasons for carefully observing the constant movement of the pectoral fins when the fish is at rest is to counteract the propulsion caused by the drainage of the gill holes, so that the fish can stay in a certain position.

The phenomenon of using the force of gill aperture drainage to assist the movement of fish is generally more obvious when the fish body is advancing rapidly, or when the fish changes from a stationary state to a moving state. The first type is the main one, and the last two generally play a secondary role. However, the priorities of the three sports of different fish species are also different, and the application of the three sports of the same fish species in different situations is also different.

In any case, the 3 modes of movement are used alternately throughout the exercise, and if necessary, the 3 modes of movement are carried out at the same time. Therefore, it is said that fish only rely on fins.

The idea of exercising is incomplete. Hope you are satisfied

1. There are two types of fins in fish:

1. One is unpaired odd fins, such as dorsal fin, anal fin and caudal fin;

2. The other type is paired even fins, namely pectoral and pelvic fins (see appendicular bones).

Second, the role of the fish's fins:

1. The basic function of the dorsal fin and anal fin is to maintain the balance of the body, and the anal fin is relatively long, which can help swimming.

2. The tail fin mainly plays the role of propulsion and steering.

3. The main function of the even fin is to maintain the balance of the body and change the direction of movement.

Go to the pharmacy to buy gentamicin, soak the diseased fish in Qingda water, do not feed live food during the period, and feed the feed instead. Guess it's a fight Change the water and raise the temperature to 30 degrees 1Bacterial gill rot disease [**] one.

Pectoral fins are balanced to prevent swaying from side to side.

The pelvic fin is balanced, shifting direction.

The dorsal fin is balanced to prevent the fish from rolling over.

The caudal fin (caudal fin and torso) generates forward momentum and determines the direction of movement.

There is a biology book in elementary school....Forgot.

Dorsal fin: Keeping the fish on its side plays a key role in the balance of the fish, if it is lost, it will lose its balance and roll over.

Pectoral and pelvic fins: Balanced, if lost, the fish will sway from side to side.

Tail fin: Determines the direction of movement, if lost, the fish will not turn.

Anal fins: Coordinate with the other fins to play a balancing role, if lost, the body shakes slightly.

Fins also have the function of sensing water currents, so they cannot be lost.

The fish has 7 fins: the pectoral fin, the pelvic fin and the dorsal fin are used to maintain balance, the caudal fin and trunk are used to generate forward momentum, and the anal fin is mainly to keep the body upright and not tilted from side to side.

The role of the tail is to determine the direction of movement and to generate forward thrust for the fish to swim. There are many kinds of fins, and the fins of different parts have different functions.

The dorsal fin is the function of keeping the fish upright in the water and can prevent the fish from rolling over.

The anal fin coordinates the fins on the body to keep the fish balanced and prevent the fish from swaying from side to side when swimming.

The pectoral fin is used for balancing and assisting steering.

The pelvic fin is used to reduce speed and maintain balance.

When the fins of the fish are damaged, the keeper needs to change the water immediately to keep the water clean and avoid re-infection of the fins. Also raise the water temperature above 25, which will speed up their metabolism and also speed up the speed at which they heal. If the fin damage is severe, they need to be given a medicated bath.

Common yellow powder, oxytetracycline, etc. can be damaged by fish fins. During the ** period, the keeper needs to stop feeding, keep the environment stable, and wait for the fish to recover their fins.

Usually fish have five fins, which are pectoral fin, pelvic fin, anal fin, caudal fin, and dorsal fin, although there are also some fish that have six fins, and in addition to the five mentioned earlier, there are also adipose fins. Of course, there are also some fish whose fins are degraded, so it looks like a piece is missing. For fish, the main role of the fins is to maintain balance and swim.

Usually fish have five fins, which are pectoral fin, pelvic fin, anal fin, caudal fin, and dorsal fin, although there are also some fish that have six fins, and in addition to the five mentioned earlier, there are also adipose fins. Of course, there are also some fish whose fins are degraded, so it looks like a piece is missing. For fish, the main role of the fins is to maintain balance and swim.

1. Provide power: The reason why fish can swim in the water is by fins, most of which are powered by tail fins, but some use dorsal fins, such as seahorses and other fish. If the fish is only swimming slowly, the pectoral fins can also act like paddles and also provide power to it.

2. Change direction: In addition to providing power, the tail fin of the fish can also change the direction of swimming, so that it can turn in the water, if it loses the tail fin, the fish can only swim in one direction. In addition to the tail fin, if the fish move upstream and downstream, they also need the pelvic fin to control it.

3. Maintain balance: For fish, the role of most fins is to keep its body balanced, so that it will not roll over or shake. No matter which fin you lose, the fish will become unsteady as you swim and will sway from side to side.